import random

class RandomizedSet(object):

    def __init__(self):
        """
        Initialize your data structure here.
        """
        self.dict = {}
        self.list = []

    def insert(self, val):
        """
        Inserts a value to the set. Returns true if the set did not already contain the specified element.
        :type val: int
        :rtype: bool
        """
        if val not in self.dict:
            i = len(self.list)
            self.list.append(val)
            self.dict.update({val:i})
            print(self.dict, self.list)
            return True
        else:
            return False

    def remove(self, val):
        """
        Removes a value from the set. Returns true if the set contained the specified element.
        :type val: int
        :rtype: bool
        """
        if val in self.dict:
            i = self.dict[val]
            del self.dict[val]
            if i!=len(self.list)-1:
                self.list[i]=self.list[-1]
                self.dict[self.list[i]] = i
            self.list.pop()
            return True
        else:
            return False

    def getRandom(self):
        """
        Get a random element from the set.
        :rtype: int
        """
        i = int(random.random()*len(self.list))
        return self.list[i]


# Your RandomizedSet object will be instantiated and called as such:
obj = RandomizedSet()